Custom malware used in Citrix 0-day attacks targeting govt, banks, professional services
“Citrix has a history of delaying the publication of vulnerabilities, even when they’re being exploited in the wild and affecting customers.”So if you use Citrix NetScaler ADC and NetScaler Gateway appliances, and haven’t already applied the security updates, do that ASAP. But first, check your systems for signs of compromise, warns Mandiant Consulting CTO Charles Carmakal.“Given the active exploitation, NetScaler customers should prioritize examining their systems for compromise *before* upgrading/patching,” Carmakal said on LinkedIn. “If you find evidence of web shells or other malicious files, please preserve evidence and investigate the scope of the compromise.
- ▪“Citrix has a history of delaying the publication of vulnerabilities, even when they’re being exploited in the wild and affecting customers.”So if you use Citrix NetScaler ADC and NetScaler Gateway appliances, and haven’t already applied th
- ▪But first, check your systems for signs of compromise, warns Mandiant Consulting CTO Charles Carmakal.“Given the active exploitation, NetScaler customers should prioritize examining their systems for compromise *before* upgrading/patching,”
- ▪“If you find evidence of web shells or other malicious files, please preserve evidence and investigate the scope of the compromise.
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| Original publisher | The Register |
| Canonical URL | https://www.theregister.com/security/2026/09/29/custom-malware-used-in-citrix-0-day-attacks-targeting-govt-banks-professional-services/5299867 |
| Publication time | Tue, 29 Sep 2026 19:49:45 +0200 |
| Retrieval time | 2026-09-29T18:42:31.686Z |
| Last seen | 2026-09-29T18:42:31.686Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | r-kg9pWFQYVh · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); security Custom malware used in Citrix 0-day attacks targeting govt, banks, professional services Two questions remain: who is abusing the CVEs? And why did Citrix take so long to disclose? Jessica Lyons Jessica Lyons Cybersecurity Editor Published tue 29 Sep 2026 // 18:49 UTC READ MORE Certainties in life: Death, taxes, and critical Citrix vulns under attack 1 day ago ShinyHunters tells The Reg: We hacked the FBI to 'protect our business' 3 days ago Someone's attacking a critical 0-day…
Excerpt limited to ~120 words for fair-use compliance. The full article is at The Register.
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